PASSIVE METHOD FOR DETECTING OPTICAL OBJECTS AND PHOTO-DETECTOR FOR REALIZATION OF SAID METHOD Russian patent published in 2005 - IPC

FIELD: measuring equipment.

SUBSTANCE: prior to detection of optical object, dimensions and position of direction diagram of photo-detector are determined and recorded in computer memory, zone of optical blocking is set by dimensions and position of direction diagram of only the photo-detector, passive-action photo-detector without light source is used, while dynamic range of light flows in blocking zone is used, 60 dB, dynamic range of levels of optical signals of photo-diode 26 dB, optical object is registered by position of time characteristics, photo-diode signal, characteristic sign of object is determined on basis of position of time characteristics of photo-diode signal in negative or positive areas of signal values, appropriately passive or active. Photo-detector has optical block, including spherical lens and diaphragm, photo-diode, electronic board of photo-detector, including transformer for transformation of current from photo-diode to voltage, amplifier and comparator, also has base, on which input window is positioned and on which optical block, electronic board, electronic board of signals generator and electronic board of curtain control are positioned together with socket for connection to computer and indicator.

EFFECT: possible detection of optical objects without using an additionally light source with higher precision; excluded influence of daylight level changes on precision of measurements in broad dynamic range of daylight levels; possible detection of passive shadow-giving, and active, emitting, optical objects; possible determination of shape of objects and presence of accompanying fragments; possible detection of objects with optical signals of different value; higher reliability; simplified adjustment of device prior to measurements; possible portable variant of device; decreased deployment time under field conditions.

2 cl, 8 dwg